/
iscsi.py
450 lines (367 loc) · 15.7 KB
/
iscsi.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Helper code for the iSCSI volume driver.
"""
import os
import re
from oslo.config import cfg
from cinder import exception
from cinder import flags
from cinder.openstack.common import log as logging
from cinder import utils
LOG = logging.getLogger(__name__)
iscsi_helper_opt = [cfg.StrOpt('iscsi_helper',
default='tgtadm',
help='iscsi target user-land tool to use'),
cfg.StrOpt('volumes_dir',
default='$state_path/volumes',
help='Volume configuration file storage '
'directory'),
cfg.StrOpt('iet_conf',
default='/etc/iet/ietd.conf',
help='IET configuration file'),
cfg.StrOpt('lio_initiator_iqns',
default='',
help=('Comma-separatd list of initiator IQNs '
'allowed to connect to the '
'iSCSI target. (From Nova compute nodes.)'
)
)
]
FLAGS = flags.FLAGS
FLAGS.register_opts(iscsi_helper_opt)
FLAGS.import_opt('volume_name_template', 'cinder.db')
class TargetAdmin(object):
"""iSCSI target administration.
Base class for iSCSI target admin helpers.
"""
def __init__(self, cmd, execute):
self._cmd = cmd
self.set_execute(execute)
def set_execute(self, execute):
"""Set the function to be used to execute commands."""
self._execute = execute
def _run(self, *args, **kwargs):
self._execute(self._cmd, *args, run_as_root=True, **kwargs)
def create_iscsi_target(self, name, tid, lun, path,
chap_auth=None, **kwargs):
"""Create a iSCSI target and logical unit"""
raise NotImplementedError()
def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
"""Remove a iSCSI target and logical unit"""
raise NotImplementedError()
def _new_target(self, name, tid, **kwargs):
"""Create a new iSCSI target."""
raise NotImplementedError()
def _delete_target(self, tid, **kwargs):
"""Delete a target."""
raise NotImplementedError()
def show_target(self, tid, iqn=None, **kwargs):
"""Query the given target ID."""
raise NotImplementedError()
def _new_logicalunit(self, tid, lun, path, **kwargs):
"""Create a new LUN on a target using the supplied path."""
raise NotImplementedError()
def _delete_logicalunit(self, tid, lun, **kwargs):
"""Delete a logical unit from a target."""
raise NotImplementedError()
class TgtAdm(TargetAdmin):
"""iSCSI target administration using tgtadm."""
def __init__(self, execute=utils.execute):
super(TgtAdm, self).__init__('tgtadm', execute)
def _get_target(self, iqn):
(out, err) = self._execute('tgt-admin', '--show', run_as_root=True)
lines = out.split('\n')
for line in lines:
if iqn in line:
parsed = line.split()
tid = parsed[1]
return tid[:-1]
return None
def create_iscsi_target(self, name, tid, lun, path,
chap_auth=None, **kwargs):
# Note(jdg) tid and lun aren't used by TgtAdm but remain for
# compatibility
utils.ensure_tree(FLAGS.volumes_dir)
vol_id = name.split(':')[1]
if chap_auth is None:
volume_conf = """
<target %s>
backing-store %s
</target>
""" % (name, path)
else:
volume_conf = """
<target %s>
backing-store %s
%s
</target>
""" % (name, path, chap_auth)
LOG.info(_('Creating iscsi_target for: %s') % vol_id)
volumes_dir = FLAGS.volumes_dir
volume_path = os.path.join(volumes_dir, vol_id)
f = open(volume_path, 'w+')
f.write(volume_conf)
f.close()
old_persist_file = None
old_name = kwargs.get('old_name', None)
if old_name is not None:
old_persist_file = os.path.join(volumes_dir, old_name)
try:
(out, err) = self._execute('tgt-admin',
'--update',
name,
run_as_root=True)
except exception.ProcessExecutionError, e:
LOG.error(_("Failed to create iscsi target for volume "
"id:%(vol_id)s.") % locals())
#Don't forget to remove the persistent file we created
os.unlink(volume_path)
raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
iqn = '%s%s' % (FLAGS.iscsi_target_prefix, vol_id)
tid = self._get_target(iqn)
if tid is None:
LOG.error(_("Failed to create iscsi target for volume "
"id:%(vol_id)s. Please ensure your tgtd config file "
"contains 'include %(volumes_dir)s/*'") % locals())
raise exception.NotFound()
if old_persist_file is not None and os.path.exists(old_persist_file):
os.unlink(old_persist_file)
return tid
def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
LOG.info(_('Removing iscsi_target for: %s') % vol_id)
vol_uuid_file = FLAGS.volume_name_template % vol_id
volume_path = os.path.join(FLAGS.volumes_dir, vol_uuid_file)
if os.path.isfile(volume_path):
iqn = '%s%s' % (FLAGS.iscsi_target_prefix,
vol_uuid_file)
else:
raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
try:
# NOTE(vish): --force is a workaround for bug:
# https://bugs.launchpad.net/cinder/+bug/1159948
self._execute('tgt-admin',
'--force',
'--delete',
iqn,
run_as_root=True)
except exception.ProcessExecutionError, e:
LOG.error(_("Failed to remove iscsi target for volume "
"id:%(vol_id)s.") % locals())
raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
os.unlink(volume_path)
def show_target(self, tid, iqn=None, **kwargs):
if iqn is None:
raise exception.InvalidParameterValue(
err=_('valid iqn needed for show_target'))
tid = self._get_target(iqn)
if tid is None:
raise exception.NotFound()
class IetAdm(TargetAdmin):
"""iSCSI target administration using ietadm."""
def __init__(self, execute=utils.execute):
super(IetAdm, self).__init__('ietadm', execute)
def create_iscsi_target(self, name, tid, lun, path,
chap_auth=None, **kwargs):
self._new_target(name, tid, **kwargs)
self._new_logicalunit(tid, lun, path, **kwargs)
if chap_auth is not None:
(type, username, password) = chap_auth.split()
self._new_auth(tid, type, username, password, **kwargs)
conf_file = FLAGS.iet_conf
if os.path.exists(conf_file):
try:
volume_conf = """
Target %s
%s
Lun 0 Path=%s,Type=fileio
""" % (name, chap_auth, path)
with utils.temporary_chown(conf_file):
f = open(conf_file, 'a+')
f.write(volume_conf)
f.close()
except exception.ProcessExecutionError, e:
vol_id = name.split(':')[1]
LOG.error(_("Failed to create iscsi target for volume "
"id:%(vol_id)s.") % locals())
raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
return tid
def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
LOG.info(_('Removing iscsi_target for volume: %s') % vol_id)
self._delete_logicalunit(tid, lun, **kwargs)
self._delete_target(tid, **kwargs)
vol_uuid_file = FLAGS.volume_name_template % vol_id
conf_file = FLAGS.iet_conf
if os.path.exists(conf_file):
with utils.temporary_chown(conf_file):
try:
iet_conf_text = open(conf_file, 'r+')
full_txt = iet_conf_text.readlines()
new_iet_conf_txt = []
count = 0
for line in full_txt:
if count > 0:
count -= 1
continue
elif re.search(vol_uuid_file, line):
count = 2
continue
else:
new_iet_conf_txt.append(line)
iet_conf_text.seek(0)
iet_conf_text.truncate(0)
iet_conf_text.writelines(new_iet_conf_txt)
finally:
iet_conf_text.close()
def _new_target(self, name, tid, **kwargs):
self._run('--op', 'new',
'--tid=%s' % tid,
'--params', 'Name=%s' % name,
**kwargs)
def _delete_target(self, tid, **kwargs):
self._run('--op', 'delete',
'--tid=%s' % tid,
**kwargs)
def show_target(self, tid, iqn=None, **kwargs):
self._run('--op', 'show',
'--tid=%s' % tid,
**kwargs)
def _new_logicalunit(self, tid, lun, path, **kwargs):
self._run('--op', 'new',
'--tid=%s' % tid,
'--lun=%d' % lun,
'--params', 'Path=%s,Type=fileio' % path,
**kwargs)
def _delete_logicalunit(self, tid, lun, **kwargs):
self._run('--op', 'delete',
'--tid=%s' % tid,
'--lun=%d' % lun,
**kwargs)
def _new_auth(self, tid, type, username, password, **kwargs):
self._run('--op', 'new',
'--tid=%s' % tid,
'--user',
'--params=%s=%s,Password=%s' % (type, username, password),
**kwargs)
class FakeIscsiHelper(object):
def __init__(self):
self.tid = 1
def set_execute(self, execute):
self._execute = execute
def create_iscsi_target(self, *args, **kwargs):
self.tid += 1
return self.tid
class LioAdm(TargetAdmin):
"""iSCSI target administration for LIO using python-rtslib."""
def __init__(self, execute=utils.execute):
super(LioAdm, self).__init__('cinder-rtstool', execute)
try:
self._execute('cinder-rtstool', 'verify')
except (OSError, exception.ProcessExecutionError):
LOG.error(_('cinder-rtstool is not installed correctly'))
raise
def _get_target(self, iqn):
(out, err) = self._execute('cinder-rtstool',
'get-targets',
run_as_root=True)
lines = out.split('\n')
for line in lines:
if iqn in line:
return line
return None
def create_iscsi_target(self, name, tid, lun, path,
chap_auth=None, **kwargs):
# tid and lun are not used
vol_id = name.split(':')[1]
LOG.info(_('Creating iscsi_target for volume: %s') % vol_id)
# cinder-rtstool requires chap_auth, but unit tests don't provide it
chap_auth_userid = 'test_id'
chap_auth_password = 'test_pass'
if chap_auth != None:
(chap_auth_userid, chap_auth_password) = chap_auth.split(' ')[1:]
extra_args = []
if FLAGS.lio_initiator_iqns:
extra_args.append(FLAGS.lio_initiator_iqns)
try:
command_args = ['cinder-rtstool',
'create',
path,
name,
chap_auth_userid,
chap_auth_password]
if extra_args != []:
command_args += extra_args
self._execute(*command_args, run_as_root=True)
except exception.ProcessExecutionError as e:
LOG.error(_("Failed to create iscsi target for volume "
"id:%(vol_id)s.") % locals())
LOG.error("%s" % str(e))
raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
iqn = '%s%s' % (FLAGS.iscsi_target_prefix, vol_id)
tid = self._get_target(iqn)
if tid is None:
LOG.error(_("Failed to create iscsi target for volume "
"id:%(vol_id)s.") % locals())
raise exception.NotFound()
return tid
def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
LOG.info(_('Removing iscsi_target: %s') % vol_id)
vol_uuid_name = 'volume-%s' % vol_id
iqn = '%s%s' % (FLAGS.iscsi_target_prefix, vol_uuid_name)
try:
self._execute('cinder-rtstool',
'delete',
iqn,
run_as_root=True)
except exception.ProcessExecutionError as e:
LOG.error(_("Failed to remove iscsi target for volume "
"id:%(vol_id)s.") % locals())
LOG.error("%s" % str(e))
raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
def show_target(self, tid, iqn=None, **kwargs):
if iqn is None:
raise exception.InvalidParameterValue(
err=_('valid iqn needed for show_target'))
tid = self._get_target(iqn)
if tid is None:
raise exception.NotFound()
def initialize_connection(self, volume, connector):
volume_iqn = volume['provider_location'].split(' ')[1]
(auth_method, auth_user, auth_pass) = \
volume['provider_auth'].split(' ', 3)
# Add initiator iqns to target ACL
try:
self._execute('cinder-rtstool', 'add-initiator',
volume_iqn,
auth_user,
auth_pass,
connector['initiator'],
run_as_root=True)
except exception.ProcessExecutionError as e:
LOG.error(_("Failed to add initiator iqn %s to target") %
connector['initiator'])
raise exception.ISCSITargetAttachFailed(volume_id=volume['id'])
def get_target_admin():
if FLAGS.iscsi_helper == 'tgtadm':
return TgtAdm()
elif FLAGS.iscsi_helper == 'fake':
return FakeIscsiHelper()
elif FLAGS.iscsi_helper == 'lioadm':
return LioAdm()
else:
return IetAdm()